a reeling sensation; a feeling that you are about to fall
"The dizzying drop-off at the cliff edge sent a wave of vertigo through me, making my stomach churn as if I were plummeting toward the rocks below."
A sensation of whirling and loss of balance, caused by looking down from a great height or by disease affecting the inner ear.
"The dizzying drop-off at the cliff's edge sent a wave of vertigo through me as I tried to steady my footing."